Astrid Gjelstad

Associate Professor - Section for Pharmaceutical Chemistry
Image of Astrid Gjelstad
Norwegian version of this page
Room 209
Username
Visiting address Sem Sælands vei 3 Farmasibygningen 0371 Oslo
Postal address Postboks 1068 Blindern 0316 Oslo

Academic Interests

The academic field of interest is development of new microextraction technology for rapid and selective isolation of drugs and peptides from small amounts of biological matrices.The microextraction technology is based on artificial liquid membranes where studies of the transport across the membranes forced by either passive diffusion (Liquid Phase Microextraction, LPME) or electrokinetic migration (Electro Membrane Extraction) are special focus areas. The technologies can be used in the field of pharmaceutical analysis, bioanalysis or environmental analysis. 

Higher education and employment history

  • PhD 2009
  • Master in Pharmacy 2004

 

Publications

  • Mestad, Ingrid Oksavik; Gjelstad, Astrid; Pedersen-Bjergaard, Stig & Øiestad, Elisabeth Leere (2021). Green and sustainable drug analysis – Combining microsampling and microextraction of drugs of abuse. Sustainable Chemistry and Pharmacy. ISSN 2352-5541. 24, p. 1–9. doi: 10.1016/j.scp.2021.100517.
  • Ask, Kristine Skoglund; Lid, Marthe; Øiestad, Elisabeth Leere; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2019). Liquid-phase microextraction in 96-well plates - calibration and accurate quantification of pharmaceuticals in human plasma samples. Journal of Chromatography A. ISSN 0021-9673. 1602, p. 117–123. doi: 10.1016/j.chroma.2019.06.013.
  • Vårdal, Linda; Øiestad, Elisabeth Leere; Gjelstad, Astrid; Jensen, Henrik & Pedersen-Bjergaard, Stig (2019). Electromembrane extraction with solvent modification of the acceptor solution: improved mass transfer of drugs of abuse from human plasma. Bioanalysis. ISSN 1757-6180. 11(8), p. 755–771. doi: 10.4155/bio-2018-0308.
  • Gjelstad, Astrid (2019). Three-phase hollow fiber liquid-phase microextraction and parallel artificial liquid membrane extraction. TrAC. Trends in analytical chemistry. ISSN 0165-9936. 113, p. 25–31. doi: 10.1016/j.trac.2019.01.007.
  • Rosting, Cecilie; Tran, Elin Vyvy; Gjelstad, Astrid & Halvorsen, Trine Grønhaug (2018). Determination of the Low-Abundant Protein Biomarker hCG from Dried Matrix Spots using Immunocapture and Nano Liquid Chromatography Mass Spectrometry . Journal of Chromatography B: Biomedical Sciences and Applications. ISSN 1387-2273. 1077-1078, p. 44–51. doi: 10.1016/j.jchromb.2018.01.016. Full text in Research Archive
  • Andersen, Ida Kristine Lysgaard; Rosting, Cecilie; Gjelstad, Astrid & Halvorsen, Trine Grønhaug (2018). Volumetric absorptive MicroSampling vs. other blood sampling materials in LC-MS-based protein analysis - preliminary investigations. Journal of Pharmaceutical and Biomedical Analysis. ISSN 0731-7085. 156, p. 239–246. doi: 10.1016/j.jpba.2018.04.036. Full text in Research Archive
  • Vårdal, Linda; Wong, Gladys; Øiestad, Åse Marit Leere; Pedersen-Bjergaard, Stig; Gjelstad, Astrid & Øiestad, Elisabeth Leere (2018). Rapid determination of designer benzodiazepines, benzodiazepines, and Z-hypnotics in whole blood using parallel artificial liquid membrane extraction and UHPLC-MS/MS. Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 410(20), p. 4967–4978. doi: 10.1007/s00216-018-1147-y.
  • Vårdal, Linda; Øiestad, Elisabeth Leere; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2018). Electromembrane extraction of substances with weakly basic properties: A fundamental study with benzodiazepines. Bioanalysis. ISSN 1757-6180. 10(10), p. 769–781. doi: 10.4155/bio-2018-0030.
  • Ask, Kristine Skoglund; Øiestad, Elisabeth Leere; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2018). Dried blood spots and parallel artificial liquid membrane extraction – A simple combination of microsampling and microextraction. Analytica Chimica Acta. ISSN 0003-2670. 1009, p. 56–64. doi: 10.1016/j.aca.2018.01.024.
  • Olsen, Katharina Norgren; Ask, Kristine Skoglund; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2018). Parallel artificial liquid membrane extraction of psychoactive analytes: a novel approach in therapeutic drug monitoring. Bioanalysis. ISSN 1757-6180. 10(6), p. 385–395. doi: 10.4155/bio-2017-0250.
  • Huang, Chuixiu; Shen, Xiantao; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2018). Investigation of alternative supported liquid membranes in electromembrane extraction of basic drugs from human plasma. Journal of Membrane Science. ISSN 0376-7388. 548, p. 176–183. doi: 10.1016/j.memsci.2017.11.001.
  • Huang, Chuixiu; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2017). Electromembrane extraction with alkylated phosphites and phosphates as supported liquid membranes. Journal of Membrane Science. ISSN 0376-7388. 526, p. 18–24. doi: 10.1016/j.memsci.2016.11.049.
  • Restan, Magnus Saed; Jensen, Henrik; Shen, Xiantao; Huang, Chuixiu; Martinsen, Ørjan Grøttem & Kubáň, Pavel [Show all 8 contributors for this article] (2017). Comprehensive study of buffer systems and local pH effects in electromembrane extraction. Analytica Chimica Acta. ISSN 0003-2670. 984, p. 116–123. doi: 10.1016/j.aca.2017.06.049.
  • Huang, Chuixiu; Chen, Zhiliang; Gjelstad, Astrid; Pedersen-Bjergaard, Stig & Shen, Xiantao (2017). Electromembrane extraction. TrAC. Trends in analytical chemistry. ISSN 0165-9936. 95, p. 47–56. doi: 10.1016/j.trac.2017.07.027.
  • Gjelstad, Astrid; Andresen, Alf Terje; Dahlgren, Anders; Gundersen, Thomas Erik & Pedersen-Bjergaard, Stig (2017). High-throughput liquid-liquid extraction in 96-well format: Parallel artificial liquid membrane extraction. LC GC North America. ISSN 1527-5949. 35(3), p. 192–196.
  • Fernández, Elena; Vårdal, Linda; Vidal, Lorena; Canals, Antonio; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2017). Complexation-mediated electromembrane extraction of highly polar basic drugs – a fundamental study with catecholamines in urine as model system . Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 409, p. 4215–4223. doi: 10.1007/s00216-017-0370-2.
  • Pedersen-Bjergaard, Stig; Huang, Chuixiu & Gjelstad, Astrid (2017). Electromembrane extraction – Recent trends and where to go. Journal of Pharmaceutical Analysis. ISSN 2095-1779. 7(3), p. 141–147. doi: 10.1016/j.jpha.2017.04.002. Full text in Research Archive
  • Rosting, Cecilie; Gjelstad, Astrid & Halvorsen, Trine Grønhaug (2017). Expanding the knowledge on dried blood spots and LC-MS-based protein analysis: two different sampling materials and six protein targets. Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 409(13), p. 3383–3392. doi: 10.1007/s00216-017-0280-3.
  • Vårdal, Linda; Gjelstad, Astrid; Huang, Chuixiu; Øiestad, Elisabeth Leere & Pedersen-Bjergaard, Stig (2017). Efficient discrimination and removal of phospholipids during electromembrane extraction from human plasma samples. Bioanalysis. ISSN 1757-6180. 9(8), p. 631–641. doi: 10.4155/bio-2017-0027.
  • Vårdal, Linda; Askildsen, Hilde- Merete; Gjelstad, Astrid; Øiestad, Elisabeth Leere; Edvardsen, Hilde Marie Erøy & Pedersen-Bjergaard, Stig (2017). Parallel artificial liquid membrane extraction of new psychoactive substances in plasma and whole blood. Journal of chromatography. B. ISSN 1570-0232. 1048, p. 77–84. doi: 10.1016/j.jchromb.2017.02.010. Full text in Research Archive
  • Pilarova, Veronika; Sutani, Mumtaz; Ask, Kristine Skoglund; Novakova, Lucie; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2017). One-step extraction of polar drugs from plasma by parallel artificial liquid membrane extraction. Journal of chromatography. B. ISSN 1570-0232. 1043, p. 25–32. doi: 10.1016/j.jchromb.2016.09.019.
  • Gjelstad, Astrid; Andresen, Alf Terje; Dahlgren, Anders; Gundersen, Thomas Erik & Pedersen-Bjergaard, Stig (2017). High-throughput liquid-liquid extraction in 96-well format: Parallel artificial liquid membrane extraction. LC GC Europe. ISSN 1471-6577. 30(1), p. 10–17. Full text in Research Archive
  • Huang, Chuixiu; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2016). Organic solvents in electromembrane extraction: recent insights. Analitical chemistry (Tel Aviv, 1993). ISSN 0793-0135. 35(4), p. 169–183. doi: 10.1515/revac-2016-0008.
  • Kuban, Pavel; Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2016). Micro-electromembrane extraction using multiple free liquid membranes and acceptor solutions – Towards selective extractions of analytes based on their acid-base strength. Analytica Chimica Acta. ISSN 0003-2670. 943, p. 64–73. doi: 10.1016/j.aca.2016.09.022.
  • Huang, Chuixiu; Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2016). Electromembrane extraction of polar basic drugs from plasma with pure bis(2-ethylhexyl) phosphite as supported liquid membrane. Analytica Chimica Acta. ISSN 0003-2670. 934, p. 80–87. doi: 10.1016/j.aca.2016.06.002.
  • Ask, Kristine Skoglund; Turgay, Bardakci; Parmer, Marthe Petrine; Halvorsen, Trine Grønhaug; Øiestad, Elisabeth Leere & Pedersen-Bjergaard, Stig [Show all 7 contributors for this article] (2016). Parallel artificial liquid membrane extraction as an efficient tool for removal of phospholipids from human plasma. Journal of Pharmaceutical and Biomedical Analysis. ISSN 0731-7085. 129, p. 229–236. doi: 10.1016/j.jpba.2016.07.011.
  • Rosting, Cecilie; Sæ, Christine Østvik; Gjelstad, Astrid & Halvorsen, Trine Grønhaug (2016). Evaluation of water-soluble DBS for small proteins: A conceptual study using insulin as a model analyte. Bioanalysis. ISSN 1757-6180. 8(10), p. 1051–1065. doi: 10.4155/bio-2016-0002.
  • Ask, Kristine Skoglund; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2016). Dried blood spots on carboxymethyl cellulose sheets: Rapid sample preparation based on dissolution and precipitation. Chromatographia. ISSN 0009-5893. 79, p. 509–514. doi: 10.1007/s10337-016-3039-7.
  • Øiestad, Elisabeth Leere; Øiestad, Åse Marit Leere; Gjelstad, Astrid & Karinen, Ritva Anneli (2016). Oral fluid drug analysis in the age of new psychoactive substances. Bioanalysis. ISSN 1757-6180. 8(7), p. 691–710. doi: 10.4155/bio-2015-0027.
  • Huang, Chuixiu; Jensen, Henrik; Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2016). Mass transfer in electromembrane extraction - The link between theory and experiments. Journal of Separation Science. ISSN 1615-9306. 39(1), p. 188–197. doi: 10.1002/jssc.201500905.
  • Huang, Chuixiu; Gjelstad, Astrid; Seip, Knut Fredrik; Jensen, Henrik & Pedersen-Bjergaard, Stig (2015). Exhaustive and stable electromembrane extraction of acidic drugs from human plasma. Journal of Chromatography A. ISSN 0021-9673. 1425, p. 81–87. doi: 10.1016/j.chroma.2015.11.052.
  • Pedersen-Bjergaard, Stig; Gjelstad, Astrid & Halvorsen, Trine Grønhaug (2015). Sample preparation. In Hansen, Steen Honoré & Pedersen-Bjergaard, Stig (Ed.), Bioanalysis of pharmaceuticals : sample preparation, separation techniques and mass spectrometry. Wiley-Blackwell. ISSN 978-111871682-3. p. 73–121.
  • Gjelstad, Astrid; Pedersen-Bjergaard, Stig & Seip, Knut Fredrik (2015). Electromembrane extraction as a rapid and selective miniaturized sample preparation technique for biological fluids. Bioanalysis. ISSN 1757-6180. 7(17), p. 2203–2209. doi: 10.4155/bio.15.150.
  • Rosting, Cecilie; Gjelstad, Astrid & Halvorsen, Trine Grønhaug (2015). Water-Soluble Dried Blood Spot in Protein Analysis: A Proof-of-Concept Study. Analytical Chemistry. ISSN 0003-2700. 87(15), p. 7918–7924. doi: 10.1021/acs.analchem.5b01735.
  • Huang, Chuixiu; Seip, Knut Fredrik; Gjelstad, Astrid; Shen, Xiantao & Pedersen-Bjergaard, Stig (2015). Combination of Electromembrane Extraction and Liquid-Phase Microextraction in a Single Step: Simultaneous Group Separation of Acidic and Basic Drugs. Analytical Chemistry. ISSN 0003-2700. 87(13), p. 6951–6957. doi: 10.1021/acs.analchem.5b01610.
  • Roldán-Pijuán, Mercedes; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2015). Parallel artificial liquid membrane extraction of acidic drugs from human plasma. Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 407(10), p. 2811–2819. doi: 10.1007/s00216-015-8505-9.
  • Huang, Chuixiu; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2015). Selective electromembrane extraction based on isoelectric point: Fundamental studies with angiotensin II antipeptide as model analyte. Journal of Membrane Science. ISSN 0376-7388. 481, p. 115–123. doi: 10.1016/j.memsci.2015.02.006.
  • Huang, Chuixiu; Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2015). Electromembrane extraction for pharmaceutical and biomedical analysis - Quo vadis. Journal of Pharmaceutical and Biomedical Analysis. ISSN 0731-7085. 113, p. 97–107. doi: 10.1016/j.jpba.2015.01.038.
  • Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2015). The potential of electromembrane extraction for bioanalytical applications. Bioanalysis. ISSN 1757-6180. 7(4), p. 463–480. doi: 10.4155/bio.14.303.
  • Huang, Chuixiu; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2015). Exhaustive extraction of peptides by electromembrane extraction. Analytica Chimica Acta. ISSN 0003-2670. 853(1), p. 328–334. doi: 10.1016/j.aca.2014.10.017.
  • Parmer, Marthe Petrine; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Parallel Artificial Liquid Membrane Extraction (PALME): A new tool for sample preparation. GIT Laboratory Journal Europe. ISSN 1611-6038. 18(11-12), p. 18–19. doi: 10.4155/bio.13.59.
  • Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Electromembrane extraction - Three-phase electrophoresis for future preparative applications. Electrophoresis. ISSN 0173-0835. 35(17), p. 2421–2428. doi: 10.1002/elps.201400127.
  • Seip, Knut Fredrik; Jensen, Henrik; Kieu, Elisabeth Thanh; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Salt effects in electromembrane extraction. Journal of Chromatography A. ISSN 0021-9673. 1347, p. 1–7. doi: 10.1016/j.chroma.2014.04.053.
  • Eibak, Lars Erik; Rasmussen, Knut Einar; Øiestad, Elisabeth Leere; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2014). Parallel electromembrane extraction in the 96-well format. Analytica Chimica Acta. ISSN 0003-2670. 828, p. 46–52. doi: 10.1016/j.aca.2014.04.038.
  • Huang, Chuixiu; Eibak, Lars Erik; Gjelstad, Astrid; Shen, Xiantao; Trones, Roger & Jensen, Henrik [Show all 7 contributors for this article] (2014). Development of a flat membrane based device for electromembrane extraction: A new approach for exhaustive extraction of basic drugs from human plasma. Journal of Chromatography A. ISSN 0021-9673. 1326, p. 7–12. doi: 10.1016/j.chroma.2013.12.028.
  • Seip, Knut Fredrik; Faizi, Moheba; Vergel, Cristina; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Stability and efficiency of supported liquid membranes in electromembrane extraction-a link to solvent properties. Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 406(8), p. 2151–2161. doi: 10.1007/s00216-013-7418-8.
  • Eibak, Lars Erik; Parmer, Marthe Petrine; Rasmussen, Knut Einar; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2014). Parallel electromembrane extraction in a multiwell plate. Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 406(2), p. 431–440. doi: 10.1007/s00216-013-7345-8.
  • Lødøen, Christine Pernille; Eibak, Lars Erik; Rasmussen, Knut Einar; Pedersen-Bjergaard, Stig; Andersen, Therese & Gjelstad, Astrid (2013). Storage of Oral Fluid as Dried Spots on Alginate and Chitosan foam – A New Concept for Oral Fluid Collection. Bioanalysis. ISSN 1757-6180. 5(3), p. 317–325. doi: 10.4155/BIO.12.315.
  • Seip, Knut Fredrik; Jensen, Henrik; Hovde, Marit; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2013). Electromembrane extraction: Distribution or electrophoresis? Electrophoresis. ISSN 0173-0835. 34(5), p. 792–799. doi: 10.1002/elps.201200587.
  • Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2013). Perspective: Hollow fibre liquid-phase microextraction - principles, performance, applicability, and future directions. Scientia Chromatographica. ISSN 1984-4433. 5, p. 1–10. doi: 10.4322/sc.2014.003.
  • Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2013). Electromembrane extraction from aqueous samples containing polar organic solvents. Journal of Chromatography A. ISSN 0021-9673. 1308, p. 37–44. doi: 10.1016/j.chroma.2013.07.105.
  • Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2013). Recent Developments in Electromembrane Extraction. Analytical Methods. ISSN 1759-9660. 5(18), p. 4549–4557. doi: 10.1039/c3ay40547h.
  • Gjelstad, Astrid; Rasmussen, Knut Einar; Parmer, Marthe Petrine & Pedersen-Bjergaard, Stig (2013). Parallel artificial liquid membrane extraction: micro-scale liquid–liquid–liquid extraction in the 96-well format. Bioanalysis. ISSN 1757-6180. 5(11), p. 1377–1385. doi: 10.4155/bio.13.59.
  • Eibak, Lars Erik; Hegge, Anne Bee; Rasmussen, Knut Einar; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2012). Alginate and Chitosan Foam Combined with Electromembrane Extraction for Dried Blood Spot Analysis. Analytical Chemistry. ISSN 0003-2700. 84(20), p. 8783–8789. doi: 10.1021/ac301996n.
  • Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2012). The potential application of electromembrane extraction for the analysis of peptides in biological fluids. Bioanalysis. ISSN 1757-6180. 4(16), p. 1971–1973. doi: 10.4155/BIO.12.163.
  • Gjelstad, Astrid; Rasmussen, Knut Einar & Pedersen-Bjergaard, Stig (2012). Hollow Fiber Liquid-Phase Microextraction. In Pawliszyn, Janusz & Lord, Heather L. (Ed.), Comprehensive Sampling and Sample Preparation. Elsevier. ISSN 9780123813732. p. 475–496.
  • Domínguez, Noelia Cabaleiro; Gjelstad, Astrid; Nadal, Andrea Molina; Jensen, Henrik; Petersen, Nickolaj Jacob & Hansen, Steen Honore [Show all 8 contributors for this article] (2012). Selective electromembrane extraction at low voltages based on analyte polarity and charge. Journal of Chromatography A. ISSN 0021-9673. 1248, p. 48–54. doi: 10.1016/j.chroma.2012.05.092.

View all works in Cristin

  • Skjærvø, Øystein; Pilarova, Veronika; Khalikova, Maria; Reubsaet, Leon; Halvorsen, Trine Grønhaug & Gjelstad, Astrid [Show all 10 contributors for this article] (2018). Those Who Can, Teach: Pharma Stars. The Analytical Scientist. ISSN 2051-4077. 1118, p. 40–45.
  • Skjærvø, Øystein; Pilarova, Veronika; Khalikova, Maria; Reubsaet, Leon; Halvorsen, Trine Grønhaug & Gjelstad, Astrid [Show all 10 contributors for this article] (2018). Those Who Can, Teach: Pharma Stars. The Analytical Scientist. ISSN 2051-4077. 1118, p. 40–45.
  • Gjelstad, Astrid (2017). Does Parallel Artificial Liquid Membrane Extraction Match the Requirements for an Applicable and High-Throughput Sample Preparation Method from Biological Matrices?
  • Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2017). Recent trends in drug analysis using liquid-phase microextraction.
  • Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2017). Liquid-phase microextraction (LPME) – From conceptual development and into routine laboratories.
  • Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2017). Microextraction through supported liquid membranes – Tuning the extraction chemistry for biomedical and pharmaceutical applications.
  • Pedersen-Bjergaard, Stig; Gjelstad, Astrid & Rasmussen, Knut Einar (2017). Arrested development – Given ongoing challenges in sample preparation and lack of novel alternatives, is it time to give liquid-phase microextraction (LPME) a second chance? The Analytical Scientist. ISSN 2051-4077. 49, p. 46–49.
  • Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2016). Parallel artificial liquid membrane extraction as an efficient tool for removal of phospholipids from human plasma.
  • Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2016). Drug analysis using liquid-phase microextraction – recent trends and where to go.
  • Gjelstad, Astrid (2016). Microextraction from aqueous samples based on supported liquid membranes - recent trends and new applications .
  • Gjelstad, Astrid (2016). Parallel Artificial Liquid Membrane Extraction - A New Way to Perform Selective Sample Preparation from Biological Matrices.
  • Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2016). Parallel Artificial Liquid Membrane Extraction as a Selective, Single-step Sample Preparation Method of Human Plasma Prior to LC-MS.
  • Kuban, Pavel; Boceka, Petr; Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2016). Multiple phase micro-electromembrane extraction for selective pretreatment of raw biological samples.
  • Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2016). Liquid-phase microextraction – recent trends and where to go?
  • Ask, Kristine Skoglund; Øiestad, Elisabeth Leere; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2016). Parallel Artificial Liquid Membrane Extraction - En ny metode for fjerning av fosfolipider.
  • Gjelstad, Astrid & Seip, Knut Fredrik (2015). Sample extraction techniques for biological samples: Recent advances and novel applications. Bioanalysis. ISSN 1757-6180. 7(17), p. 2133–2134. doi: 10.4155/bio.15.165.
  • Ask, Kristine Skoglund; Halvorsen, Trine Grønhaug; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2015). Phospholipid removal from human plasma samples by Parallel Artificial Liquid Membrane Extraction.
  • Gjelstad, Astrid (2015). Parallel Artificial Liquid Membrane Extraction – A New, Selective Sample Preparation Method from Biological Matrices .
  • Vårdal, Linda; Øiestad, Elisabeth Leere; Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2015). Development of Stable, Selective, and Efficient Artificial Liquid Membranes for Electromembrane Extraction (EME) .
  • Huang, Chuixiu; Seip, Knut Fredrik; Gjelstad, Astrid; Shen, Xiantao & Pedersen-Bjergaard, Stig (2015). Combination of electromembrane extraction and liquid-phase microextraction in a single step: simultaneous extraction of acidic drugs and basic drugs.
  • Gjelstad, Astrid (2015). Parallel Artificial Liquid Membrane Extraction – A New Way to Perform Selective Sample Preparation from Biological Matrices .
  • Ask, Kristine Skoglund; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2014). Dried Blood Spots på vannløselige polymere.
  • Seip, Knut Fredrik; Faizi, Moheba; Vergel, Cristina; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Erratum: Stability and efficiency of supported liquid membranes in electromembrane extraction - A link to solvent properties Microextraction Techniques (Analytical and Bioanalytical Chemistry DOI 10.1007/s00216-013-7418- 8). Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 406(8). doi: 10.1007/s00216-013-7579-5.
  • Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Electromembrane extraction – Distribution or electrophoresis?
  • Gjelstad, Astrid (2014). Parallel artificial liquid membrane extraction (PALME) - an innovative implementation of liquid-liquid extraction into a multiwell plate.
  • Gjelstad, Astrid (2014). Parallel Artificial Liquid Membrane Extraction - An Innovative Implementation of Supported Liquid Membrane Extractions into a Multiwell Plate.
  • Pedersen-Bjergaard, Stig; Gjelstad, Astrid & Parmer, Marthe Petrine (2014). Liquid-phase microextraction in the 96-well format.
  • Eibak, Lars Erik; Rasmussen, Knut Einar; Pedersen-Bjergaard, Stig & Gjelstad, Astrid (2014). Parallel Electromembrane Extraction in the 96-well format.
  • Eibak, Lars Erik; Pedersen-Bjergaard, Stig; Rasmussen, Knut Einar & Gjelstad, Astrid (2014). Water Soluble Biopolymers as Sampling Medium for Dried Blod Spot Analysis.
  • Eibak, Lars Erik; Pedersen-Bjergaard, Stig; Rasmussen, Knut Einar & Gjelstad, Astrid (2014). Ekstraksjon av legemidler fra plasma, urin og fullblod ved bruk av elektriske felt.
  • Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Elektromembranekstraksjon - Distribusjon eller elektroforese?
  • Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2014). Challenges and new directions in analytical sample preparation. Analytical and Bioanalytical Chemistry. ISSN 1618-2642. 406(2), p. 375–376. doi: 10.1007/s00216-013-7457-1.
  • Gjelstad, Astrid (2014). Parallel Artificial Liquid Membrane Extraction (PALME) - A new direction in the field of high-throughput liquid-liquid extraction.
  • Seip, Knut Fredrik; Gjelstad, Astrid & Pedersen-Bjergaard, Stig (2013). Electromembrane Extraction - Distribution or Electrophoresis?
  • Eibak, Lars Erik; Gjelstad, Astrid; Rasmussen, Knut Einar & Pedersen-Bjergaard, Stig (2013). Water Soluble Biopolymers as Sampling Medium for Dried Blood Spot Analysis.
  • Gjelstad, Astrid (2013). Parallel Artificial Liquid Membrane Extraction (PALME) - A New Direction in the Field of High-Throughput Liquid-Liquid Microextraction.
  • Gjelstad, Astrid (2013). Parallel Artificial Liquid Membrane Extraction - Micro-Scale Liquid-Liquid-Liquid Extraction in the 96-well format.
  • Pedersen-Bjergaard, Stig; Gjelstad, Astrid & Rasmussen, Knut Einar (2012). Liquid-phase microextraction based on passive diffusion and electrokinetic migration - chemistry, set-up, and applications.
  • Gjelstad, Astrid; Rasmussen, Knut Einar & Pedersen-Bjergaard, Stig (2012). Developments of Electromembrane Extraction from Post Mortem Blood and Saliva.
  • Gjelstad, Astrid; Eibak, Lars Erik; Rasmussen, Knut Einar & Pedersen-Bjergaard, Stig (2012). Electromembrane Extraction of Basic Drugs from Biological Matrices Spotted on a Water-soluble Polymer as a Novel Sampling Medium.
  • Eibak, Lars Erik; Gjelstad, Astrid; Pedersen-Bjergaard, Stig & Rasmussen, Knut Einar (2012). Recent advances in Electromembrane Extraction.
  • Gjelstad, Astrid; Rasmussen, Knut Einar & Pedersen-Bjergaard, Stig (2012). Recent Developments of Electromembrane Extraction From Biological Matrices.
  • Lødøen, Christine Pernille; Eibak, Lars Erik; Gjelstad, Astrid; Pedersen-Bjergaard, Stig; Christophersen, Asbjørg S & Øiestad, Elisabeth Leere (2012). Elektromembranekstraksjon av misbrukerstoffer direkte fra spytt.

View all works in Cristin

Published Nov. 3, 2010 3:38 PM - Last modified Dec. 3, 2015 6:53 PM

Research groups